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Your Weather First - Southern Ontario

Know before the forecast changes! This is the inside scoop on the weather forecast for the GTA and surrounding Greater Golden Horseshoe area – directly from The Weather Network’s Forecast Centre meteorologists who are making the forecast.

The insider info here will help you make better decisions when weather is a factor in your plans. We update with our latest insight on what’s changing. Check back often to get your weather first!

Warm & Humid Pattern Dominates; Unsettled at Times

Very Warm & Humid Through Mid-Week

Today and Wednesday will be the warmest days of the week with high temperatures near 30C across the region with a humidex in the mid 30s.

Today will bring a mixture of sun and clouds (mostly sunny for the western Golden Horseshoe and more clouds east) and the potential for scattered showers, especially across Niagara and east of Toronto.

Wednesday will be mostly sunny with a low risk for scattered showers or thunderstorms late in the day, but most of the region will not see any rain through Wednesday.

Rain & Thunderstorms Late Week

Thursday will be very warm and humid, but clouds will increase during the afternoon as a system approaches our region. The exact timing is still uncertain, but periods of rain and thunderstorms will develop late Thursday afternoon or evening (spreading across the region from west to east) and continue through most of Thursday night.

The threat for showers will continue into Friday, but we will have periods of rain-free weather as well.

Sunny, Seasonal and Less Humid for the Weekend

Gorgeous summer weather is expected for the weekend with abundant sunshine, lower humidity and near seasonal temperatures - much like last weekend. A passing shower is possible Sunday afternoon/evening, but most of the region will not see any rain this weekend.

Warm Start to Next Week; Becoming Unsettled

Warm weather is expected for early next week. However, we will have an increasing threat for unsettled/active weather late Monday or Tuesday.

Temperatures will be a few degrees cooler during the middle of next week with the unsettled weather.

Long Range Discussion

During the final 10 days of August and early September, it looks like Southern Ontario will be near the dividing line between a warmer pattern to our east and a cooler pattern to our west. This will likely bring some back and forth swings in temperature (which is not unusual for this time of year), but with a tendency for the warmer weather to be more dominant than the periods of cooler weather. This pattern also gives the potential for active/stormy weather at times.